CN2574299Y - Switch type audio power amplifier - Google Patents
Switch type audio power amplifier Download PDFInfo
- Publication number
- CN2574299Y CN2574299Y CN 02224398 CN02224398U CN2574299Y CN 2574299 Y CN2574299 Y CN 2574299Y CN 02224398 CN02224398 CN 02224398 CN 02224398 U CN02224398 U CN 02224398U CN 2574299 Y CN2574299 Y CN 2574299Y
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- audio
- circuit
- audio frequency
- duty ratio
- switching regulator
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Abstract
The utility model discloses a switch type audio power amplifier, which comprises an audio amplifying circuit, an audio dutyfactor modulating circuit used for generating square waves and superimposing audio-frequency sine waves to the square waves, and a switch type power amplifying circuit, and the audio amplifying circuit, the audio dutyfactor modulating circuit and the switch type power amplifying circuit are orderly connected, wherein, the operating frequency of the audio dutyfactor modulating circuit ranges from 30 to 100KHZ. Signals output by the utility model are positive and negative pulse electric signals which are modulated by the audio dutyfactor modulating circuit, and the electric signals contain audio signals. The signals are positive and negative pulse square-wave electric signals of which the dutyfactor changes. The electric signals enable a vibrating system of a loudspeaker to tightly and accurately follow the tracks of the audio electric signals which change rapidly, and the characteristic of the transient frequency response of the vibrating system is improved by many times, so the sounds of music programs played are clear, real and euphonious. A sound system composed of the audio power amplifier, a common sound box, etc., has the advantage of beautiful appearance and low cost, and is easy to like by people.
Description
Technical field:
The utility model belongs to electroacoustic playback field, particularly is used for the switching regulator audio frequency power amplifier machine of sound equipment.
Background technology:
Sound equipment power amplifier major function is that the loud speaker that audio electrical signal amplifies in the back drive audio amplifier is sounded.The signal of telecommunication of power amplifier amplification at present is the sinusoidal wave audio frequency signal of telecommunication, because the mechanical oscillation of loud speaker, when it receives the sound audio distortions that all objective reality is certain (comprising transient distortion, intermodulation distortion and harmonic distortion) that this sinusoidal wave audio frequency signal of telecommunication sends, manufacturing cost is also more and more higher, but problem of dtmf distortion DTMF is not solved all the time at all.
The utility model content:
At audible sound distortion and the more and more higher problem of its loud speaker manufacturing cost that above-mentioned prior art exists, the utility model provides a kind of low cost of manufacture, the effective switching regulator audio frequency power amplifier machine of fidelity.
The utility model comprises audio amplifier circuit, the switching regulator power amplification circuit, it is characterized in that also comprising and be used to produce square wave and the audio frequency duty ratio modulation circuit of audio frequency sine-wave superimposed to this square wave, these circuit are pressed audio amplifier circuit, audio frequency duty ratio modulation circuit, the switching regulator power amplification circuit is linked in sequence, the operating frequency of its sound intermediate frequency duty ratio modulation circuit is 30-100KHZ, the input of the audio signal ending connecting audio duty ratio modulation circuit of described audio amplifier circuit output, pulse square wave signal through the output of audio frequency duty ratio modulation circuit makes the pulse square wave of duty ratio to change for the variation with audio signal voltage amplitude size, the input P2 end of the output termination switching regulator power amplification circuit of this signal, the output of switching regulator power amplification circuit connects loud speaker through capacitor C 5.
Audio frequency duty ratio modulation circuit is made of multivibrator and resistance (R5, R6), electric capacity (C1-C2), its audio signal output connects the corresponding end that oscillator input (1,2) end meets electric capacity (C1, C2) again respectively, the end in addition of electric capacity (C1, C2) connects A, the B point of multivibrator resistance (R2, R3) respectively, A point and B point are to connecting resistance (R5-R6) end, its resistance (R5-R6) is the termination power positive pole in addition, its P2 termination switching regulator power amplification circuit input.
Audio frequency duty ratio modulation circuit also can constitute by producing circuit and square-wave and divider resistance (R7-R8), and its circuit and square-wave is by saw-toothed wave generator, and voltage comparator A1 constitutes; Its resistance R 7 of the divider resistance (R7-R8) of serial connection is the termination power positive pole in addition, and divider resistance R8 is the termination power negative pole in addition; Meet comparator A1 between the divider resistance (R7-R8) and import 7 pin, audio signal is imported 2 ends and is connect comparator A1 pin 7 through capacitor C 1, its comparator is exported 1 pin and is connect switching regulator power amplification circuit input P2 end, the end of its comparator 1 pin connecting resistance R14, the termination power positive pole in addition of R14.
Audio frequency duty ratio modulation circuit work frequency is 32KHZ-80KHZ.
Audio frequency duty ratio modulation circuit work frequency is 35KHZ-36KHZ.
The utility model is different with the existing sound equipment power amplification machine course of work.What existing power amplifier amplified is the sinusoidal wave audio frequency signal of telecommunication.And the utility model is that the sinusoidal wave audio frequency signal of telecommunication is modulated into frequency fixed voltage amplitude earlier is constant, the pulse square wave of change in duty cycle, this square wave signal of telecommunication through the modulation back output of audio frequency duty ratio modulation circuit just changes with the frequency of the audio frequency sine wave signal of telecommunication, voltage amplitude size variation and to the pulse square wave of change, be a kind of pulse square wave that contains whole tone frequency signal.After power amplification circuit output, had the square-wave signal that positive pulse and negative pulse change again, comprised the whole tone sound and the ultrasonic signal of signal frequently in the sound that this square-wave signal drive loud speaker sends.Because people's ear be can't hear ultrasonic wave sound, just can only hear the sound of whole tone frequency signal.
The utility model compared with prior art has following beneficial effect:
Because the positive negative pulse stuffing square-wave signal of the utility model change in duty cycle in the rise and fall of the Wave crest and wave trough of the sine wave of audio frequency change arbitrarily, all includes the positive and negative variation of the voltage amplitude of positive negative pulse stuffing square wave.To the effect that the vibrational system of loud speaker produces a kind of push-pull effort, make the mechanical oscillation of speaker vibration system can correctly closely follow the waveform trace of audio frequency sine wave signal by the electromagnetic force of these positive and negative alternations.This mechanical oscillation of following audio signal have just produced and the very real sound of former audio signal.So this pulse square wave signal of telecommunication makes transient distortion, intermodulation distortion and the harmonic distortion of loud speaker drop to minimum degree.Make the instantaneous frequency response characteristic of loud speaker improve manyfold, this is one of effective effect of the present utility model.
Two of effect is: the signal of telecommunication that the utility model amplifies is a kind of pulse square wave signal, and its amplification process is operated on off state, is subjected to the influence of non-linear components and parts very little, therefore, and almost nil distortion in amplification process.
Three of effect is: line principle of the present utility model is simpler, and the cost of manufacture cost is lower, and the audio amplifier that is connected with the utility model can use low-grade common audio amplifier, and its playback effect can reach the hi-fi effect of high end audio fully.
Description of drawings:
Fig. 1 is the utility model integrated circuit block diagram.
Fig. 2 is Fig. 1 audio frequency duty ratio modulation circuit and switch amplifying circuit schematic diagram.
Fig. 3 is the another kind of audio frequency duty ratio modulation circuit theory diagrams of Fig. 2.
Embodiment:
Referring to Fig. 1-3, the utility model comprises audio amplifier circuit, audio frequency duty ratio modulation circuit, switching regulator power amplification circuit.The operating frequency of described audio frequency duty ratio modulation circuit is 30-100KHZ, and optimized frequency is 32KHZ-80KHZ, and frequency optimum traffic is 35-36KHZ.The audio signal of described audio amplifier circuit output connects 1,2 ends that audio frequency duty ratio modulation circuit is imported respectively through many emitter-base bandgap gradings of its amplifying circuit triode VT1 and collector electrode, and the pulse square wave of exporting through audio frequency duty ratio modulation circuit connects the switching regulator power amplification circuit P2 end of being made up of triode VT4-VT8.Pulse square wave signal is amplified by the switching regulator power amplification circuit after output termination capacitor C 5 is exported to loud speaker, becomes the pulse electrical signal conversion acoustic radiating to go out by loud speaker.
See Fig. 2, audio frequency duty ratio modulation circuit, the multivibrator of forming by triode VT2, VT3 resistance R 1-R4, capacitor C 3, C4, add electric capacity C1, C2 again, resistance R 5, R6 constitute, and input 1,2 ends that the input of its audio signal connects audio frequency duty ratio modulation circuit connect the corresponding end of capacitor C 1, C2 again respectively, and the end in addition of capacitor C 1, C2 connects the resistance R 2 of multivibrator, A, the B point of R3 respectively, A point and B point butt joint resistance R 5, R6 one end, the termination power positive pole in addition of its resistance R 5, R6.
See Fig. 3, other plants audio frequency duty ratio modulation circuit, can be made of the circuit and divider resistance R7, the R8 that produce pulse square wave signal.Its pulse square wave signal circuit is by saw-toothed wave generator, voltage comparator A1 constitutes, its saw-toothed wave generator is by voltage comparator B 1, resistance R 9-R13, capacitor C 6, diode D forms, described divider resistance R7, voltage comparator A1 imports 7 pin between the R8, the sawtooth voltage signal of saw-toothed wave generator output meets voltage comparator A1 and imports 6 pin, audio signal is through capacitor C 1 connecting resistance R7, between the R8 and meet voltage comparator A1 and import 7 pin, it is exported 1 pin and connects and draw resistance R 14, pull-up resistor R14 is the termination power positive pole in addition, and voltage comparator A1 imports 1 pin and connects switch power amplifying circuit input P2 end.
See Fig. 2 again, the switch power amplifying circuit is that the pulse square wave signal of audio frequency duty ratio modulation circuit output is amplified, and increases power output, drives the circuit that loud speaker takes place, and this circuit is made of triode VT4-VT8, resistance R 15, R16, capacitor C5.The pulse square wave signal of its audio frequency duty ratio modulation circuit output end P2 output connects the base stage of triode VT8 through resistance R 15, the emitter of triode VT8 connects power cathode, the base stage of collector connecting transistor VT4, the VT6 of triode VT8 and an end of resistance R 16, the termination power positive pole in addition of resistance R 16; Its triode VT4, VT5 form the positive half cycle signal of telecommunication that multiple tube amplifies pulse square wave, and triode VT6, VT7 form the negative half period signal of telecommunication that multiple tube amplifies pulse square wave; The emitter of its triode VT4 connects the base stage of triode VT5, and the emitter of triode VT5 connects emitter and the collector electrode of triode VT7 and the end of capacitor C5 of triode VT6; The collector electrode of its triode VT4, VT5 connects positive source, the base stage of the collector connecting transistor VT7 of triode VT6, and the emitter of triode VT6 connects collector electrode and the emitter of triode VT5 and the end of capacitor C 5 of triode VT7; The emitter of triode VT7 connects power cathode, the end of termination loud speaker in addition of its capacitor C5, the termination power negative pole in addition of loud speaker.
The course of work of the present utility model is:
When audio amplifier circuit did not have the audio electrical signal input, audio frequency duty ratio modulation circuit did not have the audio electrical signal input yet.At this moment audio frequency duty ratio modulation circuit output frequency inconvenience becomes, voltage amplitude is constant, the pulse square wave that duty ratio is also constant is exported to loud speaker, at this moment in the sound that loud speaker sends after the switch power amplifying circuit amplifies, have only faint ultrasonic signal, do not have the sound of audio signal.Because people's ear does not have sensation to ultrasonic signal, so just can't hear any sound.
When audio amplifier circuit output had audio electrical signal, audio frequency duty ratio modulation circuit output frequency was constant, and voltage amplitude is constant, the pulse square wave signal of telecommunication of change in duty cycle.This change in duty cycle be wide, the narrow variation of waveform and along with audio voltage amplitude size variation the pulse square wave signal of telecommunication of respective change, zoom into the signal of telecommunication with positive and negative pulse square wave through the switch power amplifying circuit, the sound that sends ultrasonic signal and audio signal through loud speaker comes, people's ear be can't hear ultrasonic signal, just can only hear the sound of audio signal.This principle that makes loud speaker send audio signal is that a string wide shape pulse electromagnetic gross energy is greater than a string narrow shape pulse electromagnetic gross energy.This big electromagnetic energy makes the vibrational system of loud speaker produce mechanical oscillation, just produces sound.
Claims (5)
1, a kind of switching regulator audio frequency power amplifier machine, comprise audio amplifier circuit, the switching regulator power amplification circuit, it is characterized in that also comprising and be used to produce square wave and the audio frequency duty ratio modulation circuit of audio frequency sine-wave superimposed to this square wave, these circuit are pressed audio amplifier circuit, audio frequency duty ratio modulation circuit, the switching regulator power amplification circuit is linked in sequence, the operating frequency of its sound intermediate frequency duty ratio modulation circuit is 30-100KHZ, the input of the audio signal ending connecting audio duty ratio modulation circuit of described audio amplifier circuit output, pulse square wave signal through the output of audio frequency duty ratio modulation circuit makes the pulse square wave of duty ratio to change for the variation with audio signal voltage amplitude size, the input P2 end of the output termination switching regulator power amplification circuit of this signal, the output of switching regulator power amplification circuit connects loud speaker through capacitor C 5.
2, a kind of switching regulator audio frequency power amplifier machine according to claim 1, it is characterized in that: described audio frequency duty ratio modulation circuit is made of multivibrator and resistance (R5, R6), electric capacity (C1-C2), its audio signal output connects the corresponding end that oscillator input (1,2) end meets electric capacity (C1, C2) again respectively, the end in addition of electric capacity (C1, C2) connects A, the B point of multivibrator resistance (R2, R3) respectively, A point and B point are to connecting resistance (R5-R6) end, its resistance (R5-R6) is the termination power positive pole in addition, its P2 termination switching regulator power amplification circuit input.
3, a kind of switching regulator audio frequency power amplifier machine according to claim 1 is characterized in that: audio frequency duty ratio modulation circuit also can constitute by producing circuit and square-wave and divider resistance (R7-R8), and its circuit and square-wave is by saw-toothed wave generator, and voltage comparator A1 constitutes; Its resistance R 7 of the divider resistance (R7-R8) of serial connection is the termination power positive pole in addition, and divider resistance R8 is the termination power negative pole in addition; Meet comparator A1 between the divider resistance (R7-R8) and import 7 pin, audio signal is imported 2 ends and is connect comparator A1 pin 7 through capacitor C 1, its comparator is exported 1 pin and is connect switching regulator power amplification circuit input P2 end, the end of its comparator 1 pin connecting resistance R14, the termination power positive pole in addition of R14.
4, according to claim 1,2 or 3 described a kind of switching regulator audio frequency power amplifier machines, it is characterized in that: described audio frequency duty ratio modulation circuit work frequency is 32KHZ-80KHZ.
5, a kind of switching regulator audio frequency power amplifier machine according to claim 4, it is characterized in that: described audio frequency duty ratio modulation circuit work frequency is 35KHZ-36KHZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02224398 CN2574299Y (en) | 2002-07-05 | 2002-07-05 | Switch type audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02224398 CN2574299Y (en) | 2002-07-05 | 2002-07-05 | Switch type audio power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2574299Y true CN2574299Y (en) | 2003-09-17 |
Family
ID=33701821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02224398 Expired - Fee Related CN2574299Y (en) | 2002-07-05 | 2002-07-05 | Switch type audio power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2574299Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633952A (en) * | 2012-08-23 | 2014-03-12 | 捷讯研究有限公司 | Switching mode amplifier operation |
| CN103875118A (en) * | 2011-10-07 | 2014-06-18 | 丰田自动车株式会社 | Lithium-ion secondary battery |
-
2002
- 2002-07-05 CN CN 02224398 patent/CN2574299Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103875118A (en) * | 2011-10-07 | 2014-06-18 | 丰田自动车株式会社 | Lithium-ion secondary battery |
| CN103875118B (en) * | 2011-10-07 | 2016-03-30 | 丰田自动车株式会社 | Lithium rechargeable battery |
| CN103633952A (en) * | 2012-08-23 | 2014-03-12 | 捷讯研究有限公司 | Switching mode amplifier operation |
| CN103633952B (en) * | 2012-08-23 | 2017-04-26 | 黑莓有限公司 | switching mode amplifier operation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |